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The Louisiana Purchase, The Mexican American War, The Purchase of Alaska and the Annexation of Texas.
The country enlarged its territory with the annexation of the island
Since "Manifest Destiny" was the belief that the U.S. was ordained by God to spread to the Pacific Ocean, the annexation of Mexican territory is the best answer here. The other issues deal with slavery or slavery in the territories of the United States.
The United States has extended its territory through the Louisiana Purchase in 1803, the annexation of Texas in 1845, the Oregon Treaty of 1846, and the Treaty of Guadalupe Hidalgo in 1848 following the Mexican-American War.
Texas.
"Admission." States are admitted to the Union. Territories can be annexed (e.g. Hawai'i Territory) or purchased (e.g. Louisiana Territory) or ceded (e.g. Mexican Cession).
The abolitionists thought it was a bad deal. They thought it would strip them of their rights of holding slaves due to the annexation of territory. This created uncertainty for the abolitionists.
The Mexican-American War was an armed conflict between the United States and Mexico from 1846 to 1848 in the wake of the 1845 U.S. annexation of Texas, which Mexico considered part of its territory despite the 1836 Texas Revolution.
Annexation
The abolitionists thought it was a bad deal. They thought it would strip them of their rights of holding slaves due to the annexation of territory. This created uncertainty for the abolitionists.
The process of adding a territory to a country is called annexation. During annexation, a territory is acquired and established within an existing political unit.
Texas